She hasn’t been laying. And she flattens herself on the nest, growls, and has plucked a spot on her chest. Aren’t those all signs of being broody? And in any case, I tried putting the chicks with her. It worked for a little while. She gave them a few curious pecks, then settled in. I had put her in a dog crate, and after about fifteen minutes, when the chicks had come out and were exploring a bit, she seemed to realize that she was penned up, and ran away. So... that failed. But it was worth a shot anyway.